Tunable structural color of anodic tantalum oxide films

• 来源期刊: 中国物理B（英文版）
• 关键词: anodic tantalum oxide structural color spectroscopic ellipsometry optical interference
• 年，卷（期）: 2012,（8）
• 页码范围: 527-531
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/1674-1056/21/8/088101

摘要

Tantalum (Ta) oxide films with tunable structural color were fabricated easily using anodic oxidation.The structure,components,and surface valence states of the oxide filns were investigated by using gazing incidence X-ray diffractometry,X-ray photoelectron microscopy,and surface analytical techniques.Their thickness and optical properties were studied by using spectroscopic ellipsometry and total reflectance spectrum.Color was accurately defined using L*a*b* scale.The thickness of compact Ta2O5 films was linearly dependent on anodizing voltage.The film color was tunable by adjusting the anodic voltage.The difference in color appearance resulted from the interference behavior between the interfaces of air-oxide and oxide-metal.